The Number

81645

Eighty-One Thousand Six Hundred and Forty-Five

In Base 21 Unovigesimal Is

8h2i21

The numbers with a 21 subscript use Base 21 Unovigesimal notation.

For more familiar numbers: See Eighty-One Thousand Six Hundred and Forty-Five in Base 10 Decimal

Nearby Numbers

Positive, nonzero integers within three units

81642
8h2f21
Eighty-One Thousand Six Hundred and Forty-Two in Base 21 Unovigesimal
81643
8h2g21
Eighty-One Thousand Six Hundred and Forty-Three in Base 21 Unovigesimal
81644
8h2h21
Eighty-One Thousand Six Hundred and Forty-Four in Base 21 Unovigesimal
81646
8h2j21
Eighty-One Thousand Six Hundred and Forty-Six in Base 21 Unovigesimal
81647
8h2k21
Eighty-One Thousand Six Hundred and Forty-Seven in Base 21 Unovigesimal
81648
8h3021
Eighty-One Thousand Six Hundred and Forty-Eight in Base 21 Unovigesimal

Scientific Notation

Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.

8.1645e4

Reciprocal

A number multiplied with its reciprocal is one.

0.0002809kk2k5866921

The reciprocal of 81645 in Base 21 Unovigesimal.

Palindrome?

A numerical palindrome has the same value when all of its digits are reversed.

The number 8h2i21 is not a palindrome.

Not A Prime Number

A prime number is a positive integer that is divisible only by itself and one.

Eighty-one thousand six hundred and forty-five is a composite number with 8 total factors (including 1 and itself).   See primes in Base 21 Unovigesimal

A Composite

Composites have more than just these two factors.

Eighty-one thousand six hundred and forty-five is a composite number with 8 total factors (including 1 and itself).

Prime Factors

The prime factors of a positive integer are the integers that divide it exactly and are also prime.

The number eighty-one thousand six hundred and forty-five has the following 3 prime factors:

3
321
Three in Base 21 Unovigesimal
5
521
Five in Base 21 Unovigesimal
5443
c7421
Five Thousand Four Hundred and Forty-Three in Base 21 Unovigesimal

Prime Factorization

The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities

3211 · 5211 · c74211 = 8h2i21

Base Conversions

The number eighty-one thousand six hundred and forty-five in 35 different bases